Question

National Park improvement and conclusion

Answer 1

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Conclusions and Recommendations

The preceding chapters described the scientific and legal framework of efforts to protect and improve visibility, as well as methods for attributing visibility impairment to sources and for assessing alternative control measures. This chapter discusses the implications of current knowledge for future regulatory and research efforts. The committee did not presuppose a particular form for a visibility program because the design of a program involves many policy issues outside the bounds of science and the committee's expertise. However, present scientific knowledge about visibility impairment in Class I areas has several implications for policy makers.

GENERAL CONCLUSIONS

Any effective strategy to accomplish the statutory goal of remedying and preventing anthropogenic visibility impairment in Class I areas must limit emissions of pollutants that can cause regional haze.

Incontrovertible scientific evidence links emissions of air pollutants to the formation of haze that limits visibility and degrades the visual environment. Almost all the effects of air pollution on visibility are caused by airborne particles. In most cases, visibility degradation is caused by five kinds of particulate substances (and associated particulate water): sulfates (SO42-), nitrates (NO3-), organic matter, elemental carbon, and

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